Color reference system for display monitor

US6933967B2 · kind B2 · utility

Assignees

• SONY GROUP CORPORATION · JP
• SONY ELECTRONICS INC. · US

Inventors

• Paul David Doyle · San Marcos, US
• Rafael Calderon · San Diego, US
• Matthew Boyko · San Francisco, US
• Roy Bragadeste · Round Rock, US
• Don Moore · Renton, US
• Mike McKay · Shoreline, US
• Karl Lang · Berlin, DE
• Andrew Bryant · Los Gatos, US
• Martin Kolinek · Bellevue, US

Key dates

• Filing date: Sep 9, 2003
• Grant date: Aug 23, 2005
• Expiry date: Sep 9, 2023

Classification

• Technology area (CPC H): Electricity
• CPC primary: H04N9/73
• WIPO field: Audio-visual technology
• WIPO sector: Electrical engineering

Abstract

A color calibration system includes a visual display terminal (VDT), a color calibration sensor optically coupled to the VDT, and a computer processing unit (CPU) electrically coupled to the VDT and the color calibration sensor. The VDT has a display screen and a plurality of color channels, each color channel having an intensity input, a bias input, and a gain input. The VDT produces an image on the display screen responsive to the intensity input. The color calibration sensor provides values responsive to the chromaticity and luminance of a test patch portion of the image on the display screen. The CPU performs calibration of the VDT including setting the bias of each color channel to reduce the difference between a target black point and the test patch with the intensity input at a minimum value for each color channel.